Integration of a zero dead-volume PDMS rotary switch valve in a miniaturised (bio)electroanalytical system

Neus Godino, Francisco Javier del Campo, Francesc Xavier Munoz, Mikkel Fougt Hansen, Jörg Peter Kutter, Detlef Snakenborg

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    This work features the design, fabrication and characterisation of a miniaturised electroanalytical lab on a chip that allows the performance of a complete bioassay, from the capture of magnetic particles through their functionalisation and sample incubation to the detection of electroactive reaction products. The system is built using mainly polymeric materials such as PMMA and PDMS and fast prototyping techniques such as milling and moulding. The system also includes a set of microelectrodes, photo-lithographed on a silicon chip. The novelty lies in the design of the rotary microvalve, which contains a microreactor so that various reaction and incubation steps can be carried out in isolation from the detection event with zero dead volume. This avoids contamination and fouling of the electrodes by proteins or other organic matter, and extends the useful lifetime of the detector. The system operation is demonstrated by a model example, consisting in the functionalisation of streptavidin-coated magnetic particles with biotinylated beta-galactosidase over periods ranging from 5 to 15 min, at which point the particles saturate. Although the system is intended for the development of enzyme-based electrochemical bioassays, the concept of its rotary microreactor can be applied more broadly.
    Original languageEnglish
    JournalLab on a Chip
    Volume10
    Issue number14
    Pages (from-to)1841-1847
    ISSN1473-0197
    DOIs
    Publication statusPublished - 2010

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